public static OneShotDispatcherTimer CreateAndStart(TimeSpan duration, EventHandler callback)
{
var timer = new OneShotDispatcherTimer {Duration = duration};
timer.Fired += callback;
timer.Start();
return timer;
}
private void RequestCachePruning()
{
lock (this)
{
if (_cachePruningTimer != null || _cachePruningTimestamp.Add(CachePruningInterval) >= DateTime.UtcNow)
{
return;
}
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
if (_cachePruningTimer != null)
{
return;
}
_cachePruningTimer = OneShotDispatcherTimer.CreateAndStart(CachePruningTimerDuration, OnCachePruningTimerFired);
});
}
}
private void OnCachePruningTimerFired(object sender, EventArgs e)
{
if (sender != _cachePruningTimer)
{
return;
}
_cachePruningTimer = null;
_cachePruningTimestamp = DateTime.UtcNow;
ThreadPool.QueueUserWorkItem(state => PruneCache());
}